What an I-Cord Is and Why You'd Use One

An i-cord (short for "idiot cord," though the name is misleading) is a small tube of knitting that looks like a thin rope. It's made by knitting in the round on just two or three stitches, and it comes out as a cord about the thickness of a pencil or thinner, depending on your yarn weight and needle size.

I-cords are useful for several things: edging blankets and scarves, making drawstrings for bags, attaching as decorative trim, or even knitting them into a larger project as you go. Once you understand the basic motion, you can make them in any yarn and any length you want.

Key Takeaways

  • An i-cord is made by casting on 3 to 5 stitches and knitting every row without turning your work around.
  • The trick is sliding your stitches back to the working end of the needle after each row instead of turning the needle over.
  • You need double-pointed needles or a circular needle short enough that you can slide stitches easily.
  • The cord forms naturally as you repeat the same motion; tension stays even if you pull the working yarn snug at the start of each row.

What Needles and Yarn You'll Need

You need needles that let you knit from either end without turning your work. A pair of double-pointed needles (usually sold in sets of four or five) works best for beginners. You can also use a very short circular needle, though that takes a bit more practice to keep stitches from sliding off.

The needle size should match your yarn weight the same way it would for any knitting project—check the label on your yarn for the recommended needle size. For a standard worsted-weight yarn, size US 8 to 10 needles will give you a cord about the thickness of a shoelace. Thinner yarn and smaller needles make a thinner cord; thicker yarn and larger needles make a thicker one.

You don't need much yarn—a single ball will make a very long cord. If you're making a drawstring or trim, a few yards is plenty.

Casting On and Starting Your I-Cord

Cast on 3 to 5 stitches using your preferred method. Three stitches makes a thin, delicate cord; 4 or 5 stitches makes a thicker, more substantial one. For your first attempt, 4 stitches is a good middle ground.

Once your stitches are on the needle, you're ready to start. Don't turn the needle around. Instead, you'll knit across the stitches from left to right (or right to left, depending on which hand you favor), and then slide those stitches back to the working end of the needle without flipping it over. This is the core move that makes an i-cord work.

The Knitting Motion: Slide, Knit, Repeat

Here's the step-by-step motion for each row. First, slide all your stitches to the right end of your needle (the end where your working yarn is attached). Pull the working yarn snug—this is important, because it tightens the gap between rows and keeps your cord from looking loose and floppy.

Now knit across all your stitches as you normally would, from left to right. When you reach the end, you'll have a new row of stitches on your right needle. Slide those stitches back to the left end of the needle (or whichever end you started from). Pull the yarn snug again, and repeat.

The cord forms as you go. After a few rows, you'll see a tube starting to take shape. Keep the tension even by pulling that working yarn snug at the start of each row—this is what keeps the cord looking neat instead of gappy.

Keeping Your Stitches From Sliding Off

With double-pointed needles, stitches can slide off the ends if you're not careful. A straightforward fix is to use a stitch marker or even a rubber band looped around the end of the needle to catch any stitches that try to escape. Slide it down past your stitches before you start knitting, and move it as needed.

If you're using a circular needle, the cord is less likely to unravel, but the needle itself can be awkward to work with at first because it's so short. Practice with double-pointed needles first, then move to a circular if you want to.

Binding Off Your I-Cord

When your cord is as long as you need it, bind off all your stitches using your standard bind-off method. A basic knit bind-off works fine: knit two stitches, pass the first stitch over the second, knit one more stitch, pass the first over the second, and repeat until one stitch remains. Cut your yarn and pull the tail through the last stitch to find it.

Weave in the yarn ends with a tapestry needle. Because the cord is so small, the ends can be hidden inside the tube itself if you thread them carefully.

Using Your I-Cord: Attaching and Finishing

Once your cord is finished, you can sew it onto a project using a tapestry needle and matching yarn. For an edge trim, a whip stitch (sewing through the bumps on the back of the cord and into the edge of your main piece) holds it securely and looks neat.

If you're making a drawstring, thread it through eyelets or a casing using a tapestry needle. For a cord that will take wear, make sure your seams are tight and your yarn is strong enough for the job.

Frequently Asked Questions

Can I make an i-cord with regular straight needles?

Not easily. Straight needles have a stopper at one end, so you can't slide stitches back to the working end. Double-pointed needles or a circular needle are designed for this motion and make the work much faster.

What if my cord looks twisted or uneven?

Uneven tension is usually the culprit. Make sure you're pulling the working yarn snug at the start of each row—this tightens the gap between rows and keeps the cord from looking loose. If it's twisted, you may have accidentally turned the needle at some point. Just keep knitting; it usually evens out as the cord grows.

How long can I make an i-cord?

As long as you want. The only limit is how much yarn you have. Many people make cords several feet long for drawstrings or trim. Just keep the same rhythm and tension, and the cord will stay consistent.

Can I use a different number of stitches?

Yes. Two stitches makes a very thin cord that's almost like a thread; 6 or 7 stitches makes a thicker rope. Experiment with different stitch counts to see what thickness works for your project.

Do I have to knit every row, or can I purl?

You can purl every row instead, which gives a slightly different texture, or alternate knit and purl rows for a ribbed effect. The basic motion stays the same—slide, work the stitches, repeat.